How to Write a Sample letter

This is the letter to convey my apology letter how to end a conversation that longs for a long time. First of all I should regret for my behaviour and I regret for it in a very precise manner. I know the conversation that was taking for a long time without an end. Now am here to finish it. Let the mistake be mine and let me be the one who came in the wrong side. I request you to apologise me. I hope you could understand my position. I promise you that I will not let this to happen one more time. Please accept my apology and allow me to get back to my work. And am sure this would be my last apology that am asking.